If You Want to Live... Shoot! (1968)

A young cowboy, Johnny, playing in a rigged poker game is forced to shoot one of the other players. The cowboy takes quick leave as he is accused of murder and a reward for his capture is posted. After being wounded, he finds refuge on a ranch and becomes involved with the family. While he is away, a gang of Mexicans kills the McGowan family except for Sally, who manages to escape and find Johnny who is now out for revenge.